Mouth ulcers

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Canker sore (aphthous ulcer)

Lichen planus on the oral mucosa

Mouth sores

Oral thrush

Mouth ulcers are sores or open lesions within the mouth, caused by various disorders. (See also mouth sores or canker sores)

Oral ulcer; Stomatitis - ulcerative; Ulcer - mouth

Mouth ulcers are caused by many disorders. These include:

• Canker sores
• Gingivostomatitis
• Herpes simplex
• Leukoplakia
• Oral cancer
• Oral lichen planus
• Oral thrush

The skin lesion of histoplasmosis may also appear as a mouth ulcer.

Canker sores are more common in young adults than in children or older adults.

Review Date: 01/18/2007
Reviewed By: Benjamin W. Van Voorhees, MD, MPH, Assistant Professor of Medicine and Pediatrics, The University of Chicago, Chicago, IL. Review provided by VeriMed Healthcare Network.